Improved pile



utrd gietenatwt @time ALBERT THOMISON, OF NORWAY, MAINE, ASSIGNOR TO HIMSELE AND i Gr. T. WHEELER, OE RIDGWAY, PENNSYLVANIA.

Letters Patent No. 97,002, Intell llto'vfmzllm' 15, 1869.

IMPROVE-'D FILE.

The Schedule referred to in these Letters Paten-tand making part of the same.

To all whom it may concern Be it known that 1,' ALBERT THOMPSON, of Norway, in the county of Oxford, and State of Maine, have invented a new and useful Improvement in Files; and I do hereby declare that the following is a full, clear, and exact description of the construction and operation of thesame, reference being had to the accompanying drawings, making a part of this specification, in whieb Figure l is a plan view, and

Figure 2 is a side elevation.

This invent-ion consists in a. single-eut at file, so constructed that when a stroke in one direction has been made, the tile may be turned over, and a return cutting stroke be made with it, thus very much expediting the labor of tiling a saw or other article.

In the drawings- A is a at le, of' the kind ordinarily u'sed for sharpening saws. In this operation, the stroke can only be made upward, or against the clamp, as, if iliade in the opposite direction, the saw is caused to tremble; hence, when a file of the usual construction is used, after making an up stroke, the filer has to carry his instrument down again to get it into the propel' position for the nextup stroke.

To avoid the loss of time consequent upon making these return motions, is the object of my invention.

My tile is made with one set of teeth, a a, inclined in one direction on one side, while the other or opposite set, b l), runs in n direction at an oblique angle thereto on the opposite side. As a consequence, after .making a stroke with the teeth a, all the ler has to do before making another stroke, is to turn the tile over in his hands and lower the upper end.- It is then readyfor cutting in the reverse direction-to the former strokeand upon the-same tooth of the saw.

Between each stroke, the file has simply to be turned side for side, which is an operation more-quickly performed than to carryfit back; hence, with this ile,a sawean be sharpened much more quickly than with one ofthefordhiary sort.

I aniaware that there is a patented lile in which the teeth are reverse on opposite sides. These teeth, however, are made -in separate pieces from the tile, and then fastened upon itin some suitable manner.

In my invention, however, the teeth are cut in the body ofthe nle.

Having thus described my invention,

That I claim as new, and desire to secure by Letters Patent, is-

An improved sin gie-cutiiat tile, having teeth whose planes of strike 01 prolongation from the opposite sides shall cross each other, but whose'dip or pitch on the two sides shall be shown in longitudinal section, as lying in the saine or pz- 'allel planes, all as shown and described.

ALBERT THOMPSON.

Witnesses:

CHAs. A. Fortuny, SoLoN G. KnnoN. 

